CN110557475A

CN110557475A - Bent limiting chain and terminal

Info

Publication number: CN110557475A
Application number: CN201810555840.2A
Authority: CN
Inventors: 李盼; 陈全龙
Original assignee: Nubia Technology Co Ltd
Current assignee: Nubia Technology Co Ltd
Priority date: 2018-05-31
Filing date: 2018-05-31
Publication date: 2019-12-10

Abstract

The invention discloses a terminal and a bending limiting chain, and provides the bending limiting chain aiming at the problem that a flexible screen terminal is easy to be bent excessively in the prior art, wherein the bending limiting chain comprises at least one limiting branched chain, the limiting branched chain comprises a plurality of limiting blocks with fixing surfaces and wearing surfaces, the fixing surfaces are opposite to the wearing surfaces, and each fixing surface comprises a connecting edge and an upper limiting edge intersected with the connecting edge; the wearing face comprises a lower limiting edge with a connecting line at two ends parallel to a connecting line at two ends of the upper limiting edge. Because adjacent limiting blocks in the limiting branched chain are connected together through the connecting edge hinge, and the linear distance between two ends of the lower limiting edge is smaller than that between two ends of the upper limiting edge, the flexible screen can be allowed to bend backwards to a certain extent by the bending limiting chain, but the flexible screen is prevented from being bent excessively; the embodiment of the invention also provides the terminal, which can prevent the flexible screen from being damaged due to excessive bending, prolong the service life of the flexible screen and improve the user experience.

Description

Bent limiting chain and terminal

Technical Field

The invention relates to the technical field of terminals, in particular to a bending limiting chain and a terminal.

Background

A flexible screen, also called an OLED (Organic Light-Emitting Diode) display screen, is a screen formed by Organic Light-Emitting diodes, and has the advantages of low power consumption, high contrast, wide color gamut, wide viewing angle, thinness, and flexibility, so that the flexible screen is widely applied to future electronic devices.

Although the flexible screen can be bent, if the bending angle of the flexible screen is not limited, the flexible screen is often bent at a large bending degree, so that the flexible screen is damaged, and other devices in the terminal are damaged due to excessive bending, so that the reliability of the terminal is affected, and the user experience is reduced.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the flexible screen terminal in the prior art is easy to damage due to excessive bending, and the reliability of the terminal and the user experience are affected; to the technical problem, a bending limiting chain and a terminal are provided.

In order to solve the technical problem, the invention provides a bending limiting chain, which comprises at least one limiting branched chain, wherein the limiting branched chain comprises a plurality of limiting blocks with fixing surfaces and wearing surfaces, the fixing surfaces are opposite to the wearing surfaces, and each fixing surface comprises a connecting edge and an upper limiting edge intersected with the connecting edge; the connecting edges of the adjacent limiting blocks are hinged to enable the limiting branched chains to be in a chain shape; the wearing face comprises a lower limiting edge with two end connecting lines parallel to the two end connecting lines of the upper limiting edge, and the linear length of the lower limiting edge is smaller than that of the upper limiting edge.

optionally, the bending limiting chain further comprises a bending power part fixedly connected with the end limiting block, and the bending power part; the bending power piece comprises two natural states, and in the first natural state, the long side of the bending power piece is in a straight line shape; in a second natural state, at least part of the long edge of the bending power piece is in an arc shape; the first natural state and the second natural state can be switched with each other under the action of external force.

Optionally, the bending power piece is a power spring piece in a curved sheet shape.

Optionally, one short side of the power spring piece is a fixed end, and the other short side of the power spring piece is a free end; the bending limiting chain comprises two power elastic pieces, namely a first power elastic piece and a second power elastic piece, and the fixed end of the first power elastic piece is fixedly connected with one tail end of the limiting branch chain; the fixed end of the second power elastic sheet is fixedly connected with the other end of the limiting branch chain.

Optionally, the bending limiting chain comprises two limiting branched chains with the same specification and arranged in parallel; two limiting blocks in two limiting branched chains, which are opposite in position, are a limiting pair, at least part of the limiting pairs in the two limiting branched chains are connected through an inter-chain connecting block, the first section of the inter-chain connecting block is arc-shaped, the bending direction and the bending radian of the arc are matched with the bending direction and the bending radian of the short edge of the power elastic sheet, and the first section is a section parallel to the connecting edge of the limiting blocks.

Optionally, the second cross section of the inter-chain connecting block is in a V shape, the V-shaped directions of the inter-chain connecting blocks in the bent limiting chain are the same, and the second cross section is a cross section parallel to the limiting block fixing surface.

Optionally, one of the two power spring pieces, which is close to the limiting branched chain, is a first power spring piece; in the process that the first power elastic piece is switched from the first natural state to the second natural state, the moving direction of the free end of the first power elastic piece faces the V-shaped opening direction of the inter-chain connecting block.

optionally, the bending limiting chain further comprises a supporting sheet, the supporting sheet is in a flat sheet shape in a natural state and can be bent under the action of external force, the supporting sheet comprises a first surface and a second surface, the first surface is used for supporting a flexible screen at the terminal, the second surface is provided with a limiting branched chain, and the supporting sheet is fixedly connected with the limiting branched chain.

Optionally, the bending limiting chain further comprises two fixing pieces, each fixing piece comprises a completely fixed end and a semi-fixed end, the completely fixed end of one fixing piece is fixedly connected with the limiting block at one end of the limiting branched chain, and the completely fixed end of the other fixing piece is fixedly connected with the limiting block at the other end of the limiting branched chain; the half-fixing ends of the two fixing pieces can be detachably connected.

Optionally, at least two limiting blocks in the limiting branched chain have different specifications.

Optionally, the limiting block at the center of the limiting branched chain is a central limiting block, and the linear length of the lower limiting edge of the central limiting block is greater than the linear lengths of the lower limiting edges of the other limiting blocks in the limiting branched chain.

Optionally, one surface of the limiting block, which simultaneously includes the upper limiting edge and the lower limiting edge, is in an inverted trapezoid shape.

Furthermore, the invention also provides a terminal, which comprises a flexible screen and the bending limiting chain, wherein the bending limiting chain is arranged on the back surface of the flexible screen, and the flexible screen is arranged on at least part of the limiting block fixing surface in the bending limiting chain.

Optionally, the terminal further comprises a bendable shell, and the bendable shell is used for being sleeved outside the bending limiting chain.

Advantageous effects

The embodiment of the invention provides a bending limiting chain and a terminal, and aims to solve the problems that a flexible screen terminal is easy to bend excessively in the prior art, so that a flexible screen and the flexible screen terminal are damaged, and user experience is influenced; the wearing face comprises a lower limiting edge with a connecting line at two ends parallel to a connecting line at two ends of the upper limiting edge. Because adjacent spacing piece is in the same place through connecting limit hinged joint in the spacing chain of buckling, and the linear distance at spacing limit both ends is less than the linear distance at last spacing limit both ends down, consequently, has certain clearance between the spacing limit down of adjacent spacing piece, and this makes the flexible screen that sets up on this spacing chain of buckling can carry out the bending dorsad to a certain extent. However, when the lower limit edge of one of the two adjacent limit blocks contacts another limit block, the flexible screen is bent backwards corresponding to the two limit blocks to the maximum extent, the flexible screen cannot be bent backwards continuously, the flexible screen is prevented from being damaged due to excessive bending, other devices of the terminal can be prevented from being damaged in the process of excessive bending, the reliability of the terminal is affected, the quality of the terminal is guaranteed, the service life of the terminal is prolonged, and the user experience is improved.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of a flexible screen bending left and right away from each other;

FIG. 2 is a schematic view of a flexible screen bending up and down and away from each other;

FIG. 3 is a front view of a buckle limiting chain according to a first embodiment of the present invention;

FIG. 4 is a diagram illustrating a linear distance between the upper limit edges according to the first embodiment of the present invention;

FIG. 5 is a front view of another buckle limiting chain according to the first embodiment of the present invention;

FIG. 6 is a front view of another buckling-restrained chain provided in the first embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a terminal according to a first embodiment of the present invention;

FIG. 8 is a schematic view of the terminal end of FIG. 7 bent into a ring shape;

FIG. 9a is a schematic view of an arrangement of buckling-restrained chains when the terminal includes a plurality of buckling-restrained chains;

FIG. 9b is a schematic view of another arrangement of each buckling-limiting chain when the terminal includes a plurality of buckling-limiting chains;

Fig. 10 is a schematic structural view of a support sheet provided in a second embodiment of the present invention;

fig. 11 is a schematic structural view of a power spring according to a second embodiment of the present invention;

FIG. 12 is a schematic view showing the positional relationship between the limiting pairs and the inter-chain connecting blocks according to the third embodiment of the present invention;

FIG. 13a is a schematic view of an inter-chain connecting block according to a third embodiment of the present invention;

FIG. 13b is a schematic view of a second cross-section of the interlink block of FIG. 13 a;

FIG. 14a is a schematic view of another inter-chain connecting block provided in a third embodiment of the present invention;

FIG. 14b is a second cross-sectional view of the intermediate connecting block of FIG. 14 a;

FIG. 15 is a bottom view of a buckle limiting chain according to a third embodiment of the present invention;

Fig. 16 is an exploded view of an assembly of the terminal provided in a fourth embodiment of the present invention;

Fig. 17 is a schematic diagram of a hardware structure of a terminal according to a fourth embodiment of the present invention.

Detailed Description

it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The first embodiment:

In order to solve the problem that the flexible screen mobile phone is easily excessively bent in the prior art, which causes the flexible screen and other devices in the mobile phone to be damaged, the embodiment provides a bending limiting chain and a terminal comprising the bending limiting chain.

The bending limiting chain can be arranged on the back surface of the terminal flexible screen and used for limiting the degree of the flexible screen bending backwards, and it should be understood that the term "back surface of the flexible screen" refers to the surface of the flexible screen opposite to the display surface. For the convenience of the following description, several typical bending modes of the flexible screen are described, and it is understood that the bending of the flexible screen can be divided into a forward bending and a backward bending. The back bending is mainly used, and because the flexible screen has the bendable performance, a user may bend the terminal to form the intelligent wristwatch to wear, and in this case, the flexible screen is bent back.

the back bending can be roughly divided into left and right back bending and up and down back bending, wherein the left and right back bending refers to a back bending mode capable of reducing the distance between the left side and the right side of the flexible screen, as shown in fig. 1. Correspondingly. The upper and lower back bending means a back bending mode for reducing the distance between the upper and lower sides of the flexible screen, please refer to the bending diagram of the flexible screen shown in fig. 2. Of course, the backward bending includes many other ways besides the two typical ways shown in fig. 1 and fig. 2, such as bending ways that change the distance between one set of diagonal vertices but keep the distance between the other set of diagonal vertices constant, and so on, and thus the description thereof is omitted here.

referring now to fig. 3, a front view of a buckle limiting chain according to the present embodiment is shown:

The buckling-limiting chain 30 includes at least one limiting branched chain, and although fig. 3 shows that the buckling-limiting chain 30 includes only one limiting branched chain, it is understood that in other examples, the buckling-limiting chain may include a plurality of limiting branched chains. The limiting branched chain comprises a plurality of limiting blocks 31, and the limiting blocks 31 are the minimum granularity of bending in the bending limiting chain 30, namely the bending limiting chain 30 cannot be bent with the granularity smaller than that of the limiting blocks. Each stopper 31 includes a fixing surface and a wearing surface, and generally, after the terminal is formed by assembling devices such as the flexible screen and the bending stopper chain 30, the flexible screen is at least located on the fixing surface of a part of the stoppers in the bending stopper chain 30, so that the fixing surface is the surface of the bending stopper chain 30 closest to the flexible screen in the stopper 31 after being assembled with the flexible screen, and the wearing surface is the surface opposite to the fixing surface. The fixing surface determines the minimum area of the flexible screen that cannot be bent away. The fixation surface includes a connecting edge and an upper limiting edge 312 that intersects the connecting edge. The wearing surface comprises a lower limiting edge 314, and a connecting line of two ends of the lower limiting edge 314 is parallel to a connecting line of two ends of the upper limiting edge 312. In one example of this embodiment, upper limiting edge 312 and lower limiting edge 314 are both aligned, and therefore, upper limiting edge 312 is parallel to lower limiting edge 314, in which case the line connecting the two ends of upper limiting edge 312 and the line connecting the two ends of lower limiting edge 314 are naturally also parallel to each other. For convenience of introduction, a surface of the limiting block 31 including both the upper limiting edge and the lower limiting edge may be referred to as a "limiting surface", and in fig. 3, the limiting surface is in an inverted trapezoid shape.

In the bending limiting chain 30, the connecting edges of adjacent limiting blocks are hinged, so that the limiting branched chains are in a chain shape, and each limiting block 31 can be bent for the minimum bending granularity. Moreover, the linear length of the upper limiting edge 312 is greater than that of the lower limiting edge 314, so that when the hinges of two adjacent limiting blocks 31 in the bending limiting chain 30 rotate, the rotation is limited: when the lower limiting edge of one limiting block contacts the other limiting block, the two limiting blocks cannot rotate in the direction continuously. Correspondingly, the flexible screen cannot be bent back to a greater extent in the corresponding region.

In the above example, it is desirable that the linear length of upper limiting edge 312 be greater than the linear length of lower limiting edge 314. Fig. 4 shows a shape of the upper limiting edge, and the linear length of the upper limiting edge refers to the linear distance between two ends, i.e. a and B in fig. 4. In some examples of this embodiment, upper limiting edge 312 and lower limiting edge 314 are straight, in which case the straight length of upper limiting edge 312 is the actual length of upper limiting edge 312, and the straight lengths at the two ends of lower limiting edge 314 are the actual lengths of lower limiting edge 314, and thus, in this case, the actual length of upper limiting edge 312 is greater than the actual length of lower limiting edge 314. It can be understood that the wearing surface can be small enough, for example, the wearing surface can be a straight line or a point, and at this time, the limiting surface of the limiting block 31 is an inverted triangle.

in fig. 3, the stopper chains 30 have the same specification of each stopper 31, which directly shows that the distance h between the fixing surface and the wearing surface of each stopper is equal in fig. 3, the linear lengths of the upper stopper edges 312 and the linear lengths of the lower stopper edges 314 of each stopper 31 are equal. However, in some other examples of the present embodiment, at least two of the limiting blocks may have different specifications, for example, in some examples, the distance h between the fixing surface and the wearing surface of the at least two limiting blocks is not equal. For another example, we refer to the limiting block at the center of the limiting branched chain as a central limiting block, and in some examples of this embodiment, the linear length of the lower limiting edge of the central limiting block is greater than the linear lengths of the lower limiting edges of the remaining limiting blocks in the limiting branched chain. As shown in fig. 5, when the lower limiting edge of each limiting block in the bending limiting chain 50 is a straight line, the actual length of the lower limiting edge of the central limiting block 502 is greater than the actual length of the lower limiting edges of the other limiting blocks 501. In other examples of this embodiment, please refer to fig. 6: in the bending limiting chain 60, the specification of each limiting block is gradually reduced from the central limiting block to the end limiting block, and the closer to the limiting block of the central limiting block 602, the greater the linear length of the upper limiting edge is, the greater the length of the lower limiting edge is; the farther away from the central stopper 602, the shorter the upper position side and the shorter the lower position side. However, in some other examples of this embodiment, the lengths of the lower limiting edges of the limiting blocks in the bending limiting chain are equal, but the closer to the limiting block of the central limiting block, the greater the length of the straight line of the upper limiting edge. Or, in some examples, the lengths of the upper limiting edges of the limiting blocks in the bending limiting chain are equal, but the straight length of the lower limiting edge of the limiting block is larger as the limiting block is closer to the central limiting block.

In an example of this embodiment, the bending limiting chain further includes two fixing members, each fixing member includes a completely fixed end and a semi-fixed end, one of the fixing members is fixedly connected to the limiting block at one end of the limiting branched chain through the completely fixed end, and the other fixing member is fixedly connected to the limiting block at the other end of the limiting branched chain through the completely fixed end.

Based on the bending limiting chain provided by each example, a terminal is introduced, and the terminal comprises a flexible screen and the bending limiting chain, wherein the bending limiting chain is arranged on the back surface of the flexible screen, and the flexible screen is at least positioned on part of the limiting block fixing surface. That is to say, the bending limiting chain is closest to the flexible screen and is a fixing surface of the limiting block.

Fig. 7 shows a schematic structural diagram of a terminal 7, the terminal 7 includes a bending limiting chain 70 and a flexible screen 71, wherein the bending limiting chain 70 includes a limiting branched chain 701, a first fixing member 702 and a second fixing member 703, a completely fixed end of the first fixing member 702 is fixedly connected to one end of the limiting branched chain 701, and a completely fixed end of the second fixing member 703 is fixedly connected to the other end of the limiting branched chain 701. Specifically, the completely fixed end of the first fixing member 702 is fixedly connected to the limiting block at the leftmost end of the limiting branched chain 701, and the completely fixed end of the second fixing member 703 is fixedly connected to the limiting block at the rightmost end of the limiting branched chain 701. The half-fixing ends of the first fixing member 702 and the second fixing member 703 can be detachably connected together. When the half-fixing ends of the first fixing member 702 and the second fixing member 703 are connected by buckling or the like, the terminal 7 is formed in a ring shape, as shown in fig. 8, and the terminal 7 can be carried by a user in a form similar to a wrist watch.

In some examples of this embodiment, the first fixing member 702 and the second fixing member 703 may be hollow structures, so that the interiors of the first fixing member 702 and the second fixing member 703 may provide a receiving chamber for receiving other devices of the terminal 7, such as a motherboard, a battery, and the like, thereby making the shape of the terminal 7 more flexible by taking advantage of the space of each part of the terminal.

when the terminal is bent in a mode of bending up and down and back to back and can be worn on the wrist of a user in a wristwatch mode, the position of the central limiting block is just the position for detecting the heart rate and other health parameters of the user. Therefore, in some examples of this embodiment, a health parameter detection sensor, such as a heart rate detection sensor, may be disposed on the wearing surface of the central limiting block, so as to detect parameters such as the heart rate of the user.

it can be understood that the state of the flexible screen under the maximum degree of bending away can be decided to the specification of stopper in the spacing chain of buckling, specifically, the last spacing limit of each stopper divides the flexible screen into the multistage along the direction that sets up of the spacing chain of buckling, can not further bend along the direction that sets up of the spacing chain of buckling in each section. The gap angle between two adjacent limiting blocks, such as the gap angle 503 in fig. 5, determines the maximum bending angle of the flexible screen at this position. The clearance included angle is the included angle between two opposite and adjacent surfaces in the two limiting blocks when the fixing surfaces of the two limiting blocks are parallel. And the parameters such as the upper limit edge of each limit block, the gap included angle of the adjacent limit block and the like are determined by the specification of each limit block, so that in some examples of the embodiment, the specification of each limit block in the bending limit chain can be set according to the shape characteristics of the wrist of a human body, and therefore when a user bends the terminal into a wristwatch form and wears the terminal at the wrist, the terminal can be more in line with the wrist shape of the user, and the best wearing experience is brought to the user.

in an example of the present embodiment, the terminal includes three bending limiting chains, and the three bending limiting chains are all disposed along the long edge of the flexible screen, as shown in fig. 9 a. In another example, as shown in fig. 9b, the terminal includes 8 buckling-limiting chains, wherein 2 buckling-limiting chains are disposed along the long side of the flexible screen; the other 6 are arranged along the short sides of the flexible screen.

In an example of the embodiment, the bending limiting chain comprises two limiting branched chains, and the two limiting branched chains have the same specification and are arranged in parallel. The same specification means that the number of the limiting blocks in the two limiting branched chains is the same, and the specifications of the two limiting blocks opposite to each other are the same. Two limiting blocks in the two limiting branched chains, which are opposite to each other, can be connected through an inter-chain connecting block. In some examples of this embodiment, the inter-chain connecting block bottom surface is flush with the face of wearing of stopper, and the user of being convenient for like this buckles to wear to the terminal.

this embodiment provides a spacing chain of buckling and a terminal, this terminal includes the flexible screen and can carry out the spacing chain of buckling that limits to the degree of buckling of flexible screen, adjacent spacing piece is in the same place through connecting limit hinged joint in this spacing chain of buckling, and the linear distance at spacing limit both ends is less than the linear distance at last spacing limit both ends down, consequently, can restrict the flexible screen and can only carry out the bending in certain limit, the problem of flexible screen receiving the damage because of the bending is excessive has been avoided, the terminal quality has been promoted.

second embodiment:

In order to make the structure and advantages of the bending limiting chain provided by the present invention clearer, the present embodiment will continue to further describe the bending limiting chain and the terminal:

first, the present embodiment provides a bending limiting chain, which includes a supporting sheet besides a limiting branched chain, and the supporting sheet is fixedly connected to the limiting branched chain. Corresponding to the bending limiting chain, the embodiment further provides a terminal, and the terminal comprises the bending limiting chain and a flexible screen.

the support sheet may be a flat sheet in a natural state, and in an example of the present embodiment, a flat sheet may be used as the support sheet. A schematic view of the support sheet is shown in fig. 10, and as can be seen from fig. 10, the support sheet 101 comprises two surfaces. In some examples of the present embodiment, the first surface 1011 of the support sheet 101 may be used to support a flexible screen of the terminal, and the second surface 1012 may be provided with a position-limiting branch. Thus, when the supporting sheet 101 is in a natural state, the flexible screen is also in a flat state along with the supporting sheet 101, and the terminal is similar to a common bar phone. After the supporting sheet 101 receives external force, the supporting sheet 101 can be bent, for example, the supporting sheet 101 bends back up and down, when the supporting sheet is bent to a certain degree, other devices can be adopted, for example, the first fixing piece and the second fixing piece which are fixedly connected to the tail ends of the limiting branched chains lock the limiting branched chains, so that the supporting sheet 101 is bent into an arc shape under the action of the external force, and thus, the whole terminal forms an annular shape, and a user can wear the terminal on the wrist in the form of a bracelet, a wristwatch and the like.

The flexible screen on the terminal may be safer during the bending process under the support of the support sheet 101, because the support sheet 101 is disposed at the back of the flexible screen, and thus, the support sheet 101 may be equivalent to the reinforcement of the flexible screen. At this time, even if in a bent state, the flexible screen is still relatively smooth as a whole, and basically has no wrinkles, so that the flexible screen is not easily damaged.

Moreover, due to the bending limiting function of the limiting branched chain in the bending limiting chain, even if external force is applied, the bending degree of the supporting sheet 101 is limited, and the bending degree can not exceed the allowable range of the bending limiting chain to the maximum extent, so that the problem that the reliability of the flexible screen is influenced because the supporting sheet and the flexible screen are excessively bent under the conditions of overlarge and overlarge external force is solved.

In the above example, the first surface 1011 of the support sheet 101 is described as supporting the terminal flexible screen, and the second surface 1012 is provided with the limiting branches, but it will be understood by those skilled in the art that the limiting branches and the flexible screen may be provided on the same surface of the support sheet in some cases. For example: the limiting branched chain is arranged on the first surface of the supporting sheet, and then the flexible screen covers the fixing surface of a part of limiting blocks in the limiting branched chain. In this solution, when the support sheet is in a natural state, the flexible screen may still be in a flat state along with the support sheet, and when the terminal is bent as a whole, the support sheet may also be bent until reaching the maximum bending degree defined by the limiting branches. However, since the support sheet is not in direct contact with the back surface of the flexible panel, the support sheet cannot directly reinforce the flexible panel.

The embodiment also provides a bending limiting chain, which can further comprise a bending power part besides the limiting branched chain. The bending power piece can be fixedly connected with a limiting block at the tail end of the limiting branched chain. In some terminals, the bending power element is interposed between the flexible screen and the retaining side of the spacing branch. The bending power piece can comprise a long side and a short side. Unlike the support sheet, the bending motor may include two natural states that are switchable with each other by an external force. In the first natural state, the long side of the bending power piece is in a straight line shape, and in the second natural state, the long side of the bending power piece is at least partially in an arc shape.

The natural state mentioned in this embodiment is a state of being free from external force, that is, the support sheet is naturally in a flat sheet shape without external force. Although the switching between the two natural states of the bending power element needs to be triggered by external force, if the bending power element is required to be maintained in a certain natural state, no additional force needs to be applied to the bending power element. Under the action of no external force, the bending power piece can have two natural forms, and the difference of the two natural forms is mainly reflected on the long-edge form of the bending power piece: in one embodiment, the long side of the bending element is linear, and in this case the bending element is in the form of a "long straight strip" as a whole, but the "strip" as referred to herein has a certain width because the bending element includes a short side. In another form, the long side of the bending power member is at least partially arc-shaped. In some examples, when the bending dynamic element is in the second natural state, the long side may be in a ring shape, and the bending dynamic element is in a ring shape as a whole.

Referring to fig. 11, the bending power member may be a curved power spring 110, and in a first natural state, a short side of the power spring 110 is arc-shaped, that is, a cross section of the power spring 110 parallel to the short side is arc-shaped; in the bending limiting chain, the arc opening of the short edge of the power elastic sheet 110 faces back to the limiting block in the limiting branched chain, the power elastic sheet 110 can be arranged on the fixing surface of the limiting block, and the arc opening of the short edge of the power elastic sheet 110 faces back to the fixing surface of the limiting block. In the second natural state, the short side of the power spring 110 is linear, so the power spring 110 is similar to a "snap ring", when the back of the power spring 110 is stressed, it will be curled into a ring shape, and the ring structure is maintained without external force to destroy the state.

As can be seen from fig. 11, the power spring 110 includes two short sides, in this embodiment, one short side of the power spring 110 may be used as a fixed end to be fixedly connected to the end limiting block of the limiting branched chain, and the other short side thereof may be used as a free end. In an example of this embodiment, the bending limiting chain includes two power spring pieces, namely a first power spring piece and a second power spring piece. The fixed end of the first power elastic sheet can be fixedly connected with a limiting block at one tail end of the limiting branched chain, and the fixed end of the second power elastic sheet is fixedly connected with a limiting block at the other tail end of the limiting branched chain. Therefore, when the limiting branched chain is gradually bent from a straight chain shape or gradually returns to a branched chain shape from a bent shape, the free ends of the two power elastic pieces can freely stretch and retract in the limiting branched chain.

The embodiment further provides a bending limiting chain, which simultaneously comprises a limiting branched chain, a bending power piece, a supporting piece, a first fixing piece and a second fixing piece, wherein the bending power piece is a first power elastic piece and a second power elastic piece. The first power elastic sheet and the second power elastic sheet are arranged between the second surface of the supporting sheet and the limiting branched chain, one short edge of the supporting sheet, the fixed end of the first power elastic sheet and a limiting block at one end of the limiting branched chain are fixedly connected to form a first fixed end, and the complete fixed end of the first fixing piece is fixedly connected with the first fixed end. The other short side of the support sheet, the fixed end of the second power spring sheet and the limiting block at the other end of the limiting branch chain are fixedly connected to form a second fixed end, and the second fixed end is also fixedly connected with the completely fixed end of the second fixing piece. The support sheet, the power spring plate, the limiting branched chain, the first fixing piece and the second fixing piece are basically and completely fixed, and when the bending limiting chain is bent gradually from a straight chain, the free end of the first power spring plate and the free end of the second power spring plate can be contracted towards the fixed ends of the first power spring plate and the second power spring plate in the bending limiting chain; when the bending limiting chain is gradually restored to be straight chain from the bent chain, the free end of the first power elastic sheet and the free end of the second power elastic sheet can extend towards the fixed end of the other side in the bending limiting chain. Through letting the one end of the power spare of buckling fixed, the other end is free, can be so that the power spare of buckling has sufficient flexible space at the spacing chain of buckling or the in-process that resumes, is favorable to realizing the form switching of the spacing chain of buckling.

Corresponding to the aforementioned bending limiting chain, the embodiment further provides a terminal, where the terminal includes the bending limiting chain and a flexible screen disposed on the first surface of the bending limiting chain supporting sheet. In a natural state, the terminal is in a flat and straight sheet shape, at the moment, the support sheet is in the natural state, and the first power elastic sheet and the second power elastic sheet are in respective first natural states. When the user beats the wrist with the back of the terminal, the first power elastic piece and the second power elastic piece in the terminal are stressed, so that the first natural state is switched to the second natural state, and the terminal is wound on the wrist of the user like an intelligent bracelet/wristwatch.

It can be understood that, when the first power spring piece and the second power spring piece are in the second natural state, the support piece is not in the natural state, so the support piece will have a tendency to return to the natural state, and the tendency will cause the first power spring piece and the second power spring piece to return to the first natural state to some extent. Therefore, in order to maintain the first power spring and the second power spring in the second natural state according to the user's requirement, in this embodiment, after the terminal is wrapped around the wrist, the user can connect the first fixing member and the half-fixing end of the second fixing member, for example, the first fixing member and the second fixing member are fastened together, and the terminal is maintained in a ring shape until the user requires the terminal to be in a straight plate shape through the action of the two fixing members.

The terminal of the spacing chain of buckling and including this spacing chain of buckling that this embodiment provided, through the flexible screen setting with the terminal on the support sheet of the spacing chain of buckling, can make the flexible screen when the support sheet is natural state to the form of straight board provides service to the user, and when the support sheet was crooked simultaneously, the flexible screen also can be crooked with comparatively level and smooth form. In addition, due to the existence of the limiting branched chain, the bending degree of the flexible screen is limited, the condition of excessive bending cannot occur, and the risk that the flexible screen is damaged is reduced.

the third embodiment:

The present embodiment will be described with reference to specific examples:

In this embodiment, the limiting bending chain includes two limiting branched chains, and the two limiting branched chains have the same specification and the same arrangement direction. Because the specifications of the two limiting branched chains are the same, the limiting blocks in the two limiting branched chains have the same number and respectively belong to the two limiting branched chains, and the specifications of the two limiting blocks in opposite positions are the same: in an example of this embodiment, the first limiting branch comprises limiting blocks, and the specifications of the four limiting blocks are A, B, C, D; then in the second limiting branch, four limiting blocks will also be included, and the specifications of the four limiting blocks are also A, B, C, D respectively. In another example of this embodiment, the first limiting branched chain includes 11 limiting blocks, where the first 5 limiting blocks are common limiting blocks, the 6 th limiting block is a central limiting block, and the 7 th to 11 th limiting blocks are common limiting blocks, and all the common limiting blocks have the same specification, the second limiting branched chain also includes 11 limiting blocks, where the 1 st to 5 th and the 7 th to 11 th limiting blocks are common limiting blocks, and only the limiting block located at the center of the limiting branched chain is the central limiting block.

for convenience of introduction, two limiting blocks in two limiting branched chains at opposite positions can be called a "limiting pair", for example, a first limiting branched chain and a second limiting branched chain are arranged in parallel to the left side of the flexible screen, and a first limiting block on the left side of the first limiting branched chain and a first limiting block on the left side of the second limiting branched chain form a limiting pair; the 5 th limiting block on the left side of the first limiting branched chain and the 5 th limiting block on the left side of the second limiting branched chain form a limiting pair. Because the specifications of the two limiting branched chains in the bending limiting chain are completely the same, in this embodiment, each limiting block in the first limiting branched chain can form a limiting pair with a corresponding limiting block in the second limiting branched chain, and similarly, each limiting block in the second limiting branched chain can also form a limiting pair with a corresponding limiting block in the first limiting branched chain.

In some examples of this embodiment, each spacing pair of two spacing branches may be independent, without a connection between the two. In other examples of this embodiment, at least some of the two position-limiting branches are fixedly connected by the inter-chain connecting block. Fig. 12 shows a position relationship between a limiting pair and a corresponding inter-chain connecting block, where the first limiting block 121 and the second limiting block 122 belong to a first limiting branched chain and a second limiting branched chain respectively, and the positions of the first limiting branched chain and the second limiting branched chain are opposite to each other in the two limiting branched chains, so as to form a limiting pair, and the inter-chain connecting block 123 is further included between the two limiting blocks, where one end of the inter-chain connecting block 123 is connected to the first limiting block 121, and the other end of the inter-chain connecting block is connected to the second limiting block.

In some examples of this embodiment, the bottom of the inter-chain connecting block and the bottom of the corresponding limiting pair, that is, the wearing surface of the limiting block, are flush, and in this case, when the bending limiting chain is linear, the bottom is relatively flat, which is convenient for the user to place and hold the terminal. As can be seen from fig. 12, the inter-chain connecting block and the limiting blocks at both sides may provide a groove-shaped accommodating cavity, and the accommodating cavity may be used to accommodate bending power members in the bending limiting chain, such as the first power spring and the second power spring. Therefore, in order to adapt the shape of the accommodating cavity to the shape of the power spring, in an example of the present embodiment, the first cross section of the inter-chain connecting block is in a circular arc shape, where the first cross section is a cross section parallel to the connecting edge of the limiting block, as shown in fig. 12. And the bending direction and the bending radian of the cross section arc of the inter-chain connecting block are matched with the bending direction and the bending radian of the short side of the power elastic sheet, so that the first power elastic sheet and the second power elastic sheet can be better placed in the accommodating cavity formed by the first limiting branched chain, the second limiting branched chain and each inter-chain connecting block.

The face of wearing of connecting block between chain and stopper flushes usually, so, the width of connecting block between the chain, the length that also follows spacing branch chain length direction is almost the same with the length of the face of wearing, consequently, there may be certain clearance between connecting block and the adjacent chain between a chain, the distance, when the spacing chain of buckling resumes the straight-chain form gradually from the state of buckling, the free end of power shell fragment will be when holding the intracavity extension, be close to that power shell fragment of connecting block between the chain like this, can insert the clearance between the connecting block between the chain at the in-process of extension very probably, make the process that the spacing chain of buckling resumes the straight-chain form from the state of buckling receive the hindrance, influence user's use and experience.

in order to avoid the above-mentioned problem, namely, in order to avoid in the process that the spacing chain of buckling resumes straight chain form state from buckling, the free end of that power shell fragment that is close to the inter-chain connecting block inserts in the clearance between the connecting block between the adjacent inter-chain, this embodiment provides a solution thinking: for convenience of description, the interface of the inter-chain connecting block parallel to the fixing surface of the limit block is referred to as a "second section". The inter-chain connecting blocks can be parallel to the section of the fixing surface of the limiting block, and the second section is not required to be regular rectangular, so that the gap between the inter-chain connecting blocks is not regular rectangular, for example, in some examples of the embodiment, the structural diagram of the inter-chain connecting blocks is shown in fig. 13 a. The second cross-section of the inter-chain connecting block shown in fig. 13a, i.e., the cross-section parallel to the plane formed by the line a and the line a' in fig. 13a, is "V" shaped as shown in fig. 13 b. Because the second cross section of each inter-chain connecting block is V-shaped, the gap between the adjacent inter-chain connecting blocks is also V-shaped, and thus, the free end of the power elastic piece cannot be inserted into the gap in the extending process.

it should be understood that the shape of the second cross-section of the inter-chain link block may also be other shapes, for example, a schematic view of the inter-chain link block structure shown in fig. 14a, if only to avoid the free end of the power spring plate from being inserted into the gap of the adjacent inter-chain link block when elongated. The second cross section of the inter-chain connecting block shown in fig. 14a, i.e., the cross section parallel to the straight line B and the straight line B' in fig. 14a, is a polygonal line including a plurality of inflection points, but of course, a wavy line or the like may be used instead of the polygonal line as long as the insertion of the free end of the power spring into the gap can be prevented.

In an example of the present embodiment, each limiting pair of the two limiting branched chains is connected by an inter-chain connecting block, and the second cross section of each inter-chain connecting block is "V" shaped, and meanwhile, the "V" shape of each inter-chain connecting block in the bending limiting chain 150 has the same direction, please refer to a bottom view of the bending limiting chain shown in fig. 15. Thus, when the bending-limiting chain 150 is in a bent state, the "V" -shaped tip of one inter-chain connecting block is slightly higher than the "V" -shaped tip of the adjacent inter-chain connecting block to which the tip is directed, that is, a certain amount of step difference is formed between the adjacent inter-chain connecting blocks. Thus, starting from any one inter-chain connecting block, it moves in the direction in which its "V" shaped tip points, all like a "down step". Under this condition, if the setting is in holding the intracavity, and the point direction that is close to the free end of the power shell fragment of inter-chain connecting block is the same with the pointed to of "V" shape, then at the spacing chain of buckling and resume to the in-process of straight chain form from the state of buckling, the extension process of free end is just similar to "lower ladder", can be more smooth and easy, and to the user, it is also lighter to resume straight board state from the curved state with control terminal, and the user experience at terminal also can promote thereupon.

Let us assume that one of the two power spring plates in the buckling-restrained chain, which is closer to the inter-chain connecting block, is the first power spring plate, and in some examples of this embodiment, the free end of the first power spring plate points to the V-shaped tip of each inter-chain connecting block. In this case, when the first power spring plate is switched from the first natural state to the second natural state, the moving direction of the free end of the first power spring plate faces to the opening direction of the V-shape of the inter-chain connecting block; on the contrary, when the first power spring plate is switched from the second natural state to the first natural state, the moving direction of the free end of the first power spring plate faces to the V-shaped tip direction of the inter-chain connecting blocks, so that the movement of the free end is like a step-down, and the inter-chain connecting blocks can be guided more easily and smoothly.

The spacing chain of buckling that this embodiment provided, including two spacing branched chains, and connect through the inter-chain connecting block between spacing branched chain to make connecting block formation cell type between each chain between two spacing branched chains and the branched chain hold the chamber, should hold shape, size etc. of chamber diapire and need place the shape, size etc. matching at this power shell fragment that holds the intracavity, consequently relatively be suitable for and accomodate the power shell fragment.

Furthermore, as the second section of each inter-chain connecting block is V-shaped, the gap between the adjacent inter-chain connecting blocks is also V-shaped, so that the free end of the first power elastic sheet can be prevented from being inserted into the gap in the extending process. Moreover, the pointed ends of the V-shaped ends of the inter-chain connecting blocks point in the same extending direction as the free end of the first power elastic sheet, so that the inter-chain connecting blocks can guide the extending direction of the free end in the extending process of the free end of the first power elastic sheet, the extending smoothness of the free end of the first power elastic sheet is improved, the smoothness of the terminal which is changed from bending to straightening is further improved, and user experience is enhanced.

The fourth embodiment:

The present embodiment will be further described with reference to the foregoing terminal as a specific example, please refer to fig. 16, and fig. 16 shows an assembled exploded view of the terminal:

the terminal 16 includes a buckle limiting chain 160, a flexible screen 170. The bending limiting chain 160 includes a first limiting branch chain 161, a second limiting branch chain 162 (in fig. 16, a partial region of the second limiting branch chain is blocked by the first limiting branch chain), and an inter-chain connecting block (not explicitly shown in fig. 16) for connecting limiting blocks at opposite positions of the first limiting branch chain 161 and the second limiting branch chain 162. The bending limiting chain 160 further includes a first power spring plate 163, a second power spring plate 164 and a support plate 165, and in addition, the bending limiting chain 160 may further include a first fixing member 166 and a second fixing member 167. In the terminal 16, the first limiting branch 161 and the second limiting branch 162 are disposed in parallel, and the specifications of the two limiting branches are the same, and the limiting block located at the middle position in the first limiting branch 161 is the central limiting block of the first limiting branch, and similarly, the central limiting block of the second limiting branch 162 is the central limiting block of the second limiting branch 162 located at the middle position in the second limiting branch 162. The inter-chain connecting block is used for connecting two limiting blocks in the first limiting branched chain 161 and the second limiting branched chain 162, which are opposite to each other in position. In the present embodiment, the inter-chain connecting blocks are parallel to the cross section of the supporting plate 165, that is, the second cross section is "V" shaped, and in the bending limiting chain 160, the "V" shape of each inter-chain connecting block is oriented in the same direction. Assuming that the lower power spring is the first power spring 163 with the fixed end on the left side in fig. 16, the free end of the first power spring 163 points to the right side, and therefore the V-shaped tip of each inter-chain connecting block also points to the right side in this embodiment.

The specification of each limiting block in the first limiting branch 161 and the second limiting branch 162 may not be very clear as shown in fig. 16, but in this embodiment, no matter the central limiting block or other limiting blocks, the distance from the fixing surface to the wearing surface, that is, the height h of the limiting blocks, is equal. In addition, the central limiting block in each limiting branched chain can be wider than other limiting blocks, namely the lower limiting edge of the central limiting block is larger than the lower limiting edges of the other limiting blocks. Therefore, devices such as a heart rate detection sensor and the like can be arranged at the central limiting block.

the front surface of the flexible screen 170 faces upwards, the back surface of the flexible screen is provided with a supporting sheet 165, and the supporting sheet 165 can be a flat steel sheet and is in a flat sheet shape in a natural state, so that the flexible screen 170 is in a flat sheet shape. Below the support plate 165, a second power spring plate 164 and a first power spring plate 163 are disposed, wherein the first power spring plate 163 is located below the second power spring plate 164 so as to be matched with the inter-chain connection block. The first power spring 163 and the second power spring 164 may be two "snap rings," and in the first natural state, the shapes of the first power spring 163 and the second power spring 164 are as shown in fig. 16; in the second natural state, the two power spring plates are curled into a ring shape.

In fig. 16, the first fixing member 166 is divided into two parts, wherein the part connected to the first limiting branch 161 and the second limiting branch 162 is the body of the first fixing member 166, and the part above the support piece 165 belongs to the upper cover of the first fixing member 166. The second fixing member 167 is similarly constructed. As can be seen from fig. 16, when supporting plate 165 is in the natural state, first fixing element 166 is not parallel to supporting plate 165, but presents a certain slope, and similarly, when supporting plate 165 is in the natural state, second fixing element 167 is also included with supporting plate 165 by an angle greater than 0 ° and smaller than 180 °, which is mainly referred to the shape of the wrist of a human body, in order to more conveniently connect the half-fixing ends of first fixing element 166 and second fixing element 167 together after terminal 16 is bent back.

In this embodiment, the body and the upper cover of the first fixing member 166 may form a containing chamber together, the body and the upper cover of the second fixing member 167 may form a containing chamber, and a processor, a battery, an RF (Radio Frequency) unit, and other devices of the terminal may be disposed in the two containing chambers.

in addition, the terminal 16 of the present embodiment further includes a bendable housing 180, and the bendable housing 180 can be sleeved outside the bending limiting chain 160. In some examples of this embodiment, the bendable housing 180 is made of silicone material, which is easy for a user to install and detach. In this embodiment, the bendable housing 180 is provided with a first limiting member, and the first limiting member is matched with a second limiting member disposed at a position corresponding to the bending limiting chain 160, so as to fix the relative position of the bendable housing 180 and the bending limiting chain 160. As shown in fig. 16, a convex point is disposed on an outer side of each limiting block as a second limiting member, and a groove is disposed at a corresponding position on an inner side of the bendable housing 180 as a first limiting member. The protrusions and the grooves may be engaged with each other, thereby detachably fixing the bendable case 180 and the bending limit chain 160 together.

In addition, different outer foldable housings 180 may have different colors, or the same outer foldable housing 180 may have different patterns on the surface thereof, so that a user can select the outer foldable housing 180 according to his/her preference, thereby changing the appearance of the terminal 16.

When the bending limiting chain is in an unbent state, namely the wearing surfaces of two adjacent limiting blocks are parallel, a certain gap exists between the wearing surfaces of the two adjacent limiting blocks in one limiting branched chain, and the gap is called as an inter-block gap. In order to make the bendable housing 180 have a smooth and beautiful appearance after the terminal 16 is bent, in this embodiment, the bottom wall of the bendable housing 180 may be thinner in the area corresponding to the inter-block gap, so that when the terminal 16 is bent, the surface of the bendable housing 180 does not form a protrusion on the outer surface due to extrusion. Assuming that the thickness of the bottom wall of the bendable housing 180 at the position opposite to the inter-block gap is d1, and the thickness of the bottom wall of the bendable housing 180 at the position opposite to the wearing face of the limiting block is d2, d1 is smaller than d 2. Generally, the thickness of the relative position of the inter-block gap can be reduced from the inner wall of the bendable shell 180, and the outer surface of the bendable shell 180 is ensured to be flat and beautiful while the corresponding position of the inter-block gap is ensured to be thin.

The assembly process of the buckle limiting chain 160 is briefly described as follows: first, the first limiting branch chain 161, the second limiting branch chain 162 and the inter-chain connecting blocks are assembled, and then the supporting sheet 165 is further connected with the fixing surfaces of the limiting blocks, so that the second surface of the supporting surface 165, the inner side surfaces of the first limiting branch chain 161 and the second limiting branch chain 162 and the inter-chain connecting blocks form an accommodating cavity together. The first powered resilient tab 163 and the second powered resilient tab 164 are then inserted into the receiving cavity. Then, the fixed ends of the support sheet 165 and the first power spring sheet 163 are fixed to the first fixing member 166, and the fixed ends of the support sheet 165 and the second power spring sheet 164 are fixed to the second fixing member 167: specifically, the two short sides of the support sheet 165, the fixed end of the first power spring plate 163 and the fixed end of the second power spring plate 164 are both provided with screw holes, so that the fixed end of the first power spring plate 163 and the body of the first fixing member 166 can be fixed, and the fixed end of the second power spring plate 164 and the body of the second fixing member 167 can be fixed; then the support sheet 165 and the upper covers of the two fixing pieces are assembled on the power spring plate and the fixing pieces, and finally the support sheet 165, the power spring plate and the fixing ends of the fixing pieces are fixed through the screw holes and the matching screws of the screws.

after the assembly of the bending limiting chain 160 is completed, the flexible screen 170 may be adhered to the first surface of the supporting sheet 165 by foam glue or other soft glue, and finally the assembled portion is entirely sleeved into the bendable housing 180, so as to realize the assembly of the terminal 16.

While the mechanical structure of the terminal 16 has been described above, and the hardware circuit composition of the terminal is briefly described, in the following description, suffixes such as "module", "part", or "unit" used to indicate elements are merely used to facilitate the description of the present invention and have no particular meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly.

The terminal may be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and the like.

Referring to fig. 17, which is a schematic diagram of a hardware structure of a mobile terminal for implementing various embodiments of the present invention, the mobile terminal 17 may include: an RF unit 171, a WiFi module 172, an audio output unit 173, an a/V (audio/video) input unit 174, a sensor 175, a display unit 176, a user input unit 177, a memory 178, a processor 179 and the like. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 17 is not intended to be limiting of mobile terminals, and that a mobile terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. For example, although not shown in fig. 17, the mobile terminal 17 may further include a bluetooth module, an interface unit, a power supply, and the like, which will not be described herein.

The terminal that this embodiment provided includes the backing sheet, can play supporting role to the flexible screen, makes the flexible screen no matter be in the state of flattening or crooked, all is more smooth, can not appear the fold. Because the terminal also comprises two power spring pieces, a user can utilize the power spring pieces to comprise two natural states, and the terminal can be bent and extended in a simpler mode. This including the shell of can buckling of terminal that this embodiment provided in addition, for example the silica gel shell, this silica gel shell can be dismantled, and whether the user can select to install the silica gel shell according to own hobby, also can select to install which kind of silica gel shell, has promoted user's autonomy. More importantly, because the region of the bottom wall of the bendable shell corresponding to the inter-block gap is arranged to be thinner, when the terminal is bent, the surface of the bendable shell can not form a bulge on the outer surface due to extrusion, and can be kept flat and attractive all the time.

it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

while the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The bending limiting chain is characterized by comprising at least one limiting branched chain, wherein the limiting branched chain comprises a plurality of limiting blocks with fixing surfaces and wearing surfaces, the fixing surfaces are opposite to the wearing surfaces, and each fixing surface comprises a connecting edge and an upper limiting edge intersected with the connecting edge; the connecting edges of the adjacent limiting blocks are hinged to enable the limiting branched chains to be in a chain shape; the wearing face comprises a lower limiting edge with two end connecting lines parallel to the two end connecting lines of the upper limiting edge, and the linear length of the lower limiting edge is smaller than that of the upper limiting edge.

2. The buckling-restrained chain of claim 1, further comprising a buckling power member fixedly connected to the end-limiting block, wherein the buckling power member; the bending power piece comprises two natural states, and in the first natural state, the long edge of the bending power piece is linear; in a second natural state, at least part of the long edge of the bending power piece is in an arc shape; the first natural state and the second natural state are switchable with each other by an external force.

3. The buckling-limiting chain of claim 2, wherein the buckling power element is a memory metal spring plate in a shape of a curved plate.

4. The buckling-limiting chain of claim 3, wherein the buckling power member is a power spring, one short side of the power spring is a fixed end, and the other short side of the power spring is a free end; the bending limiting chain comprises two power elastic pieces, namely a first power elastic piece and a second power elastic piece, and the fixed end of the first power elastic piece is fixedly connected with one tail end of the limiting branch chain; and the fixed end of the second power elastic sheet is fixedly connected with the other end of the limiting branched chain.

5. The buckling-restrained chain according to claim 4, wherein the buckling-restrained chain comprises two parallel-arranged restraining branches with the same specification; two limiting blocks in two limiting branched chains, which are opposite in position, are a limiting pair, at least part of the limiting pairs in the two limiting branched chains are connected through an inter-chain connecting block, the first section of the inter-chain connecting block is arc-shaped, the bending direction and the bending radian of the arc are matched with the bending direction and the bending radian of the short edge of the power elastic sheet, and the first section is a section parallel to the connecting edge of the limiting blocks.

6. The buckle limiting chain according to claim 5, wherein the second cross section of the inter-chain connecting block is a V-shaped cross section, the V-shaped orientation of each inter-chain connecting block in the buckle limiting chain is the same, and the second cross section is a cross section parallel to the fixing surface of the limiting block.

7. the buckling-limiting chain according to claim 6, wherein one of the two power spring pieces, which is close to the limiting branched chain, is a first power spring piece; in the process that the first power elastic piece is switched from the first natural state to the second natural state, the moving direction of the free end of the first power elastic piece faces the V-shaped opening direction of the inter-chain connecting block.

8. The buckling-limiting chain of claim 1, further comprising a support sheet, wherein the support sheet is in a flat sheet shape in a natural state and is bendable under an external force, and the support sheet comprises a first surface and a second surface, the first surface is used for supporting a flexible screen of a terminal, the second surface is provided with the limiting branched chain, and the support sheet is fixedly connected with the limiting branched chain.

9. The buckling-limiting chain of claim 1, further comprising two fixing members, wherein the fixing members comprise a completely fixed end and a semi-fixed end, the completely fixed end of one of the fixing members is fixedly connected to the limiting block at one end of the limiting branched chain, and the completely fixed end of the other fixing member is fixedly connected to the limiting block at the other end of the limiting branched chain; the half-fixing ends of the two fixing pieces are detachably connected.

10. The buckling-restrained chain according to any one of claims 1 to 9, wherein at least two of the restraint blocks in the restraint branched chains have different specifications.

11. The bending limiting chain according to claim 10, wherein the limiting block at the center of the limiting branched chain is a central limiting block, and the linear length of the lower limiting edge of the central limiting block is greater than the linear lengths of the lower limiting edges of the other limiting blocks in the limiting branched chain.

12. The buckle limiting chain according to claim 10, wherein a surface of the limiting block including both the upper limiting edge and the lower limiting edge is in an inverted trapezoid shape.

13. A terminal, comprising a flexible screen and the bending limiting chain according to any one of claims 1 to 12, wherein the limiting bending is connected to the back of the flexible screen, and the flexible screen is disposed on at least a part of the fixing surface of the limiting block in the bending limiting chain.

14. The terminal of claim 13, further comprising a bendable housing configured to fit over the kink-limiting chain.